JPS6315536A - Radiotelephony system - Google Patents

Abstract

PURPOSE:To improve the calling quality while the number of interface signal lines between a radio equipment and a telephone set is decreased by digitizing a transmission/reception sound signal, unifying a transmission line and an incoming control line and further integrating a receiving line and an outgoing control line. CONSTITUTION:The interface line 4 consists of a signal line 15 for earth or the like, a transmission in common with incoming control line 21 and a receiving in common with outgoing control line 22. A sound signal for transmission/ reception is digitized by a digital telephone set 1A and a digital radio equipment 2A. The digital telephone set 1A samples a transmission sound signal, digitizes it to insert a digitized transmission sound signal by one sample in a voice frame 33 shown in signal format diagram. Thus, the number of words (word frequency) is decided corresponding to the sample frequency of the transmission sound signal. On the other hand, the incoming control signal is subjected to formatting and the result is inserted in a control frame 34. The control frame 34 has only to be changed in response to the quantity of the incoming control signal. The similar processing is applied also to the reception and outgoing control line 22.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD This invention relates to a wireless telephone device.

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of a conventional wireless telephone device. In the figure, 1 is a telephone, 2 is a radio, 3 is an antenna, and 4 is an interface line.

FIG. 4 is a detailed explanatory diagram of the interface line,
In the figure, 11 is a transmission line for sending outgoing audio signals, 12 is a receiving line for sending incoming audio signals, 13 is an uplink control line for sending uplink control signals for controlling the radio equipment 2, etc. from the telephone 1, and 1
Reference numeral 4 designates a downlink control line for sending a downlink control signal notified from the radio device 2 or the like to the telephone set 1, and 15 represents a signal line such as ground.

Next, the operation will be explained. Since the radio telephone device is a device capable of making telephone calls using radio, the voice signal is converted into an electrical signal by the transmitter and handset of the telephone 1, and is sent to and received from the radio device 2 through the interface line 4. In radio device 2,
Modulation to the radio, demodulation from the radio, etc. are performed, and the antenna 3 transmits and receives the radio waves as radio waves, making it possible to make a telephone call via radio.

In a conventional radio telephone device, a telephone 1 and a radio 2 are separated into a transmission line 11 for transmitting voice signals and a reception line 12 for transmitting voice signals for reception, and each voice signal is transmitted and received as an analog signal. Ta. Further, upstream control signals such as dial signals and hook signals are sent through an upstream control line 13 to control the radio device 2. On the other hand, the downlink control signal for controlling the telephone 1 from the radio 2 was sent by the downlink control m14, and the signal line 15, such as the ground line, was used for other signals.

The upstream control line 13 and the downstream control line 14 correspond to control signals and are composed of one to several ``''C lines.

[Problem that the invention seeks to solve]

Conventional wireless telephone devices are configured as described above, so the number of interface lines between the wireless device and the telephone is large (and therefore expensive), and analog signals such as outgoing voice signals and control signals are required. There were problems such as the digital signals of the line being mixed together, the analog signals being mixed with noise, and the transmission/reception audio signals being degraded.

This invention was made in order to solve the above-mentioned problems, and it is a wireless telephone device that can reduce the number of interface signal lines between a wireless device and a telephone, and improve the communication quality of sending and receiving signals. The purpose is to obtain.

[Failure to solve the problem]

The radio telephone device according to the present invention uses a digital radio and a digital telephone to digitize voice signals for transmission and reception, integrates a transmission line and an uplink control line as a transmission and uplink control line, and digitizes voice signals for reception and reception. The line and the down control line are integrated as a down control line that can also be used for receiving and receiving calls.

[For production]

The uplink control line for transmitting and the downlink control line for receiving in this invention are wireless in order to integrate the uplink control line and the downlink control line for up and down control signals with the uplink control line and downlink control line for up and down control signals. The number of interface lines between the machine and the telephone is reduced, the configuration can be made at low cost, and the voice quality is improved because the transmitted and received voice signals are digitized by the digital radio and the digital telephone.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the prisoners, 1A is a digital telephone, 2 are digital radios, 15 is a signal line such as a ground, 21 is an uplink control line that also serves as a voice call, and 22 is a downstream control line that is also used as a voice receiver. One digital telephone and two digital radios digitize and transmit/receive voice signals. Figure 2 is a signal format diagram of the upstream control line 21 for transmitting and the downstream control line 22 for receiving. , 31 is a word identification frame, 32 is a word, 33 is an audio frame, and 34 is a control frame.

Next, the operation will be explained. In order to integrate the control signal and the audio signal, the audio signals for sending and receiving are digitized by two people using a digital telephone 1A and a digital radio. The method of digitization is PCM or ADPC.
M is also fine.

Sample the outgoing voice signal using a digital telephone,
Each of them will be digitized.

Audio frame 33 in the signal format diagram shown in FIG.
A digitized signal of one sample of the transmitted voice signal is inserted into the digitized signal. Therefore, the number of words (word frequency) is determined depending on the sample frequency of the transmitted audio signal.

On the other hand, the uplink control signal is formatted and expanded and inserted into the control frame 34. The control frame 34 may be changed depending on the amount of uplink control signals. The word identification frame 31 is for distinguishing between words.

The operation of the uplink control line 21 that also serves as a transmitter has been described above, but the same applies to the downlink control line 22 that also serves as a receiver. However, the digital telephone 1A converts the digitized received voice signal into an analog signal for viewing and listening.

〔Effect of the invention〕

As described above, according to the present invention, the transmitting line and the uplink control line are integrated (integrated) as the transmitting/uplink control line, and the receiving line and the downlink control line are integrated as the receiving/downlink control line. This has the effect of reducing the number of interface lines, making the equipment cheaper, and digitizing the audio signals sent and received wirelessly with digital telephones, which has the effect of improving call quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a radio telephone device according to an embodiment of the present invention, FIG. 2 is a signal format diagram of each control line in the embodiment of the present invention, and FIG. 3 is a diagram of a conventional radio telephone device. The block diagram, FIG. 4, is a configuration diagram of a conventional interface line. 1 is a digital telephone, 2A is a digital radio, 3 is an antenna, 4 is an interface line, 15 is a signal line such as a ground, 21 is an uplink control line that also serves as a transmitter, and 22 is a downlink control line that also serves as a receiver. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Representative Patent attorney 1) Hiroshi Sawa 1. (2 others) Figure 1 Figure 2 Figure 32: Word

Claims (1)

[Claims] In a radio telephone device comprising an antenna, a radio, a telephone, and an interface line between the radio and the telephone, the radio and the telephone are digital radios and digital radios that digitize and transmit/receive voice signals. The interface line is configured as a telephone set, and the interface line includes a transmitting/uplink control line for sending digitized outgoing audio signals and uplink control signals, and a receiving/downlink line for sending digitized receiving audio signals and downlink control signals. A radio telephone device comprising a control line and a signal line such as a ground line.